From fyra + kant. Compare Danish firkant (“quadrangle”) and Dutch vierkant.
fyrkant c
- a square
- (typography) em
- a foursome, fourgie
- a hash symbol
- Synonyms: brädgård, fyrtagg, grind, gärdsgård, haga, hashmark, hashtag, nummertecken, pound, spjälstaket, staket, stege, stockhög, vedstapel